[thewire]

I was not able to find it with the THX website, but the Atlantic Technology 8200 THX Ultra2 Speaker System in October, 2003 had relaxed the vertical focused verticle directivity. This was the same year that Snell released some Ultra2 so it might be safe to say 2003.

 

[looneybomber]

Although, I have a photo of a high end studio (might be Skywalker Sound - will have to check tomorrow) using S150, and just one of the front three has a different foam arrangement.

My sister's good friend, Sascha from http://www.sonicmayhem.com/ took a few pictures while he was at Skywalker. The studio monitors in the pictures I saw were B&W 802's. I'm sure they have more than one studio though.